A Feasibility Trial of Virtual Reality Neurofeedback for Adolescents With Migraine

Recruitment feasibility will be assessed by the number of participants screened and enrolled per month and the proportion of eligible participants who consent to participate.

Proportion of enrolled participants who complete the baseline/run-in phase, are successfully randomized, and complete the initial intervention training call prior to starting treatment.

Adapted 3-item Credibility scale derived from the Credibility/Expectancy Questionnaire (CEQ), modified for developmental appropriateness for youth ages 10-16. Items rated on a 5-point Likert scale; higher scores indicate greater perceived treatment credibility.

Adherence to the virtual reality intervention measured as the percent of prescribed sessions completed during the 4-week intervention phase. Participants were prescribed 3 sessions per week for 4 weeks (12 total sessions). Percent adherence will be calculated as: (number of completed sessions ÷ 12) × 100, based on portal-derived usage analytics. Higher values indicate greater adherence.

Adherence to the virtual reality intervention measured as the average duration (in minutes) of completed VR sessions during the 4-week intervention phase, based on portal-derived usage analytics. Higher values indicate longer session engagement.

Cybersickness symptoms will be assessed using a child-adapted version of the Cybersickness Symptoms Questionnaire in Virtual Reality (CSQ-VR). Participants rate the extent to which they experienced symptoms such as nausea, dizziness, visual discomfort, and imbalance during or after VR sessions on a 1 to 5 scale (1 = Not at all, 5 = A lot). Item scores will be averaged to create a mean total score, with higher scores indicating greater cybersickness symptoms. Spontaneously reported adverse events will also be recorded in the study adverse event log and summarized descriptively as an indicator of treatment tolerability.

A child-adapted version of the System Usability Scale (SUS) will be used to assess perceived usability of the virtual reality system. The SUS is a 10-item self-report questionnaire rated on a 5-point Likert scale (Strongly Disagree to Strongly Agree). Scores are calculated using standard SUS scoring procedures and transformed to a total score ranging from 0 to 100, with higher scores indicating greater perceived usability.

Proportion of randomized participants who complete the 3-month follow-up questionnaires and diary collection period.

Migraine-related disability will be assessed using the Pediatric Migraine Disability Assessment (PedMIDAS). In this study, items assess number of days of disability during the past 30 days. The 30-day total score will be multiplied by 3 to generate a 90-day equivalent score for comparability with the original instrument. Total scores range from 0 to 240, with higher scores indicating greater migraine-related disability.

Headache frequency will be measured using prospective electronic daily migraine diaries. A headache day is defined as any calendar day in which the participant reports a headache. The outcome will be the total number of headache days recorded during each 4-week monitoring period. Possible range: 0 to 28 days. Higher values indicate greater headache frequency.

Anxiety symptoms will be assessed using the 8-item PROMIS Pediatric Anxiety short form. Items are rated on a 5-point scale (Never to Always). Raw scores will be converted to standardized PROMIS T-scores (mean = 50, SD = 10), with higher scores indicating greater anxiety symptoms.

Depressive symptoms will be assessed using the 8-item PROMIS Pediatric Depression short form. Items are rated on a 5-point scale (Never to Always). Raw scores will be converted to standardized PROMIS T-scores (mean = 50, SD = 10), with higher scores indicating greater depressive symptoms.

Perceived stress will be assessed using the 10-item Perceived Stress Scale (PSS-10). Items are rated on a 5-point scale from 0 (Never) to 4 (Very Often). Four positively worded items will be reverse-scored, and item responses will be summed to generate a total score ranging from 0 to 40. Higher scores indicate greater perceived stress.

Pain-related self-efficacy will be assessed using a 7-item Pain Self-Efficacy Scale. Items are rated on a 5-point scale from 1 (Very unsure) to 5 (Very sure). Item responses will be summed to generate a total score ranging from 7 to 35, with higher scores indicating greater confidence in functioning despite pain.

Pain catastrophizing will be assessed using the 13-item Pain Catastrophizing Scale - Child version (PCS-C). Items are rated on a 5-point scale from 0 (Not at all) to 4 (Extremely). Item responses will be summed to generate a total score ranging from 0 to 52. Higher scores indicate greater pain catastrophizing.

Mean cortical source power derived from resting-state electroencephalography (EEG), calculated across standard frequency bands (delta, theta, alpha, beta, and gamma) using source-localized analysis. Power values (µV²) will be averaged within predefined brain regions (frontal, occipital, and temporal areas). Change from baseline to post-treatment will be explored.

Movement-related spectral power (µV²) derived from EEG recordings during a finger-tapping task, calculated across standard frequency bands using source-localized analysis. Power values will be averaged across predefined cortical regions. Change from baseline to post-treatment will be examined.

Mean reaction time (milliseconds) during a finger-tapping task performed during EEG assessment. Change from baseline to post-treatment will be examined.